ImportC const

[Dave P.]

On Saturday, 9 July 2022 at 17:07:16 UTC, Steven Schveighoffer 
wrote:
> Brian Callahan has a blog post about ImportC:
>
> https://briancallahan.net/blog/20220704.html
>
> One part identifies a current design choice that breaks C code:
>
> 	OK, so I built this file with clang and kept going. There was 
> one more file that DMD couldn't compile:
>
> ```
> dmd -g -O -P=-DEMACS -P=-DVI -ofexpr.o -c expr.c
> expr.c(204): Error: cannot modify `const` expression `(*es).tok`
> expr.c(205): Error: cannot modify `const` expression `(*es).val`
> ```
> 	I wonder if this is a bug in ImportC. No other C compiler 
> we've tried fails on this code.
>
> The answer is, no it's not a bug, it's by design: 
> https://dlang.org/spec/importc.html#const
>
> Is there any benefit to breaking any usage of const in C when 
> trying to compile C code?
>
> -Steve

I reported this as a bug a while ago: 
https://issues.dlang.org/show_bug.cgi?id=22759

IMO we should ignore const in this case as presumably the code 
has already compiled with a different C compiler.